From one of my favorite sites comes some very interesting information to consider on your next long flight. Here is a teaser quote from Science@NASA:
Instruments scanning outer space for cataclysmic explosions called gamma-ray bursts are detecting intense flashes of gamma-ray energy right here in the friendly skies of Earth. These terrestrial gamma-ray flashes (TGFs) surge through thunderstorms at about the same altitude where commercial airliners fly. Do these blasts of gamma-radiation pose a hazard to air travelers?
Read the full article (full of delicious science content) here:
P.S. – don’t let this stop you from booking your next international flight. The speculation is that we’re safe as the bursts are propagated upward, not horizontally toward all of us unsuspecting travelers. Phew!